Robert Nguyen, MD
NPI 1144256900 · Internal Medicine Physician · Colton, CA
Enrolled with Medicare as Practitioner - General Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Robert Nguyen, MD is a Internal Medicine Physician provider in Colton, CA (NPI 1144256900).
Provider details
- NPI number
- 1144256900
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A93153 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
480 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 443 | $185 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 19 | $132 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 18 | $119 |
Typical Medicare-allowed amounts for these services range $119–$185 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 121 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Empagliflozinbrand: Jardiance | 789 | 165 |
| Metformin Hcl | 673 | 210 |
| Losartan Potassium | 667 | 209 |
| Atorvastatin Calcium | 637 | 203 |
| Rosuvastatin Calcium | 506 | 163 |
| Amlodipine Besylate | 487 | 166 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$285 across 15 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-06-24
- Last updated
- 2008-03-31
Frequently asked questions
- What is Robert Nguyen's NPI number?
- Robert Nguyen's National Provider Identifier (NPI) is 1144256900, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Robert Nguyen's specialty?
- Robert Nguyen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Robert Nguyen located?
- Robert Nguyen's practice location on file with NPPES is 400 N Pepper Ave, Colton, CA 92324-1801.
- What is Robert Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Robert Nguyen is (909) 580-1000.
- Does Robert Nguyen accept Medicare?
- Robert Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Robert Nguyen's NPI active?
- Yes — Robert Nguyen's NPI (1144256900) is active in the NPPES registry as of the last update on 2008-03-31.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.